640852453 has 2 divisors, whose sum is σ = 640852454. Its totient is φ = 640852452.

The previous prime is 640852423. The next prime is 640852477. The reversal of 640852453 is 354258046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621903844 + 18948609 = 24938^2 + 4353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640852453 is a prime.

It is a super-2 number, since 2×640852453² = 821383733032234418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640852423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320426226 + 320426227.

It is an arithmetic number, because the mean of its divisors is an integer number (320426227).

Almost surely, 2^640852453 is an apocalyptic number.

It is an amenable number.

640852453 is a deficient number, since it is larger than the sum of its proper divisors (1).

640852453 is an equidigital number, since it uses as much as digits as its factorization.

640852453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 640852453 is about 25315.0637565857. The cubic root of 640852453 is about 862.1563217447.

The spelling of 640852453 in words is "six hundred forty million, eight hundred fifty-two thousand, four hundred fifty-three".